How feasible would a sky island be?

LTA aircraft like blimps are exploding in popularity and R&D, with Boeing, Lockheed, every silicon valley billionare, etc developing their own LTA aircraft right now.

Why haven't any companies launched permanent sky real estate yet?

I imagine it could be propelled with a combination of UAV quadrotors, hydrogen gas, solar panels powering the production of more hydrogen via electrolysis from the air around it, etc.

This thing could hold all the supply of helium in the USA fuck it. This should exist.